I think I made a mistake here, I was confused when you advised me move the previous post (about missing prestige description) from bug to coop forum.
I considered missing prestige decription as some sort of bug so I uploaded into the bug forum first.
Then you advised me to uplaod to coop forum where more people can see, which I thought you were right because Blizzard have far fewer co-op staffs than before.
Nono, I should have been more attentive but I understand it now. Thanks for clearing it up!